FREE MATLAB Scripting and Functions Questions and Answers

Question 1

Which of the following statements about MATLAB scripts and functions is TRUE?

Accepted Answer

Variables defined within a function are local to that function unless declared as global.

Answer

A script can accept input arguments and return output arguments, similar to a function.

Answer

A function can directly access variables defined in the base workspace without being passed as input.

Answer

Both scripts and functions must have the same name as their `.m` file.

Question 2

You want to create a MATLAB function that calculates the area and perimeter of a circle given its radius. Which of the following function definitions is syntactically correct and best practice for returning multiple outputs?

Accepted Answer

function [area, perimeter] = calculateCircle(radius)
  area = pi * radius^2;
  perimeter = 2 * pi * radius;
end

Answer

function calculateCircle(radius)
  area = pi * radius^2;
  perimeter = 2 * pi * radius;
  return area, perimeter;
end

Answer

function area, perimeter = calculateCircle(radius)
  area = pi * radius^2;
  perimeter = 2 * pi * radius;
end

Answer

function [output] = calculateCircle(radius)
  output.area = pi * radius^2;
  output.perimeter = 2 * pi * radius;
end

Question 3

What is the primary purpose of adding comments to your MATLAB scripts and functions?

Accepted Answer

To improve code readability and explain the logic or purpose of code sections for future reference.

Answer

To execute specific parts of the code only when certain conditions are met.

Answer

To prevent certain lines of code from executing, effectively 'disabling' them.

Answer

To define global variables that can be accessed from any part of the program.

Question 4

Consider a MATLAB script `myScript.m` containing:
```matlab
a = 10;
b = 5;
c = a + b;
disp(c);
```
If you run this script from the command window, what will be the value of variable `a` in the base workspace after `myScript.m` finishes execution?

Accepted Answer

10, because scripts operate directly in the base workspace.

Answer

Undefined, as script variables are temporary.

Answer

0, as variables are reset after script execution.

Answer

An error will occur because `a` is not declared as global.

Question 5

You have a function `myFunc.m` defined as:
```matlab
function output = myFunc(x)
  if x > 0
    output = x * 2;
  else
    output = x + 5;
  end
end
```
What is the value of `result` after executing `result = myFunc(-3);` in the command window?

Accepted Answer

2

Answer

-6

Answer

5

Answer

Error

Question 6

Which of the following is a key advantage of using functions over scripts in MATLAB for repetitive or complex tasks?

Accepted Answer

Functions inherently provide a local workspace, preventing variable clashes with the base workspace.

Answer

Functions are always executed faster than scripts.

Answer

Scripts can only be called from the command window, while functions can be called from other scripts and functions.

Answer

Functions automatically save their output variables to a `.mat` file.